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\begin{Name}{3}{\_U\_dyn\_cancel}{David Mosberger-Tang}{Programming Library}{\_U\_dyn\_cancel}\_U\_dyn\_cancel -- cancel unwind-info for dynamically generated code
\end{Name}

\section{Synopsis}

\File{\#include $<$libunwind.h$>$}\\

\Type{void} \Func{\_U\_dyn\_cancel}(\Type{unw\_dyn\_info\_t~*}\Var{di});\\

\section{Description}

The \Func{\_U\_dyn\_cancel}() routine cancels the registration of the
unwind-info for a dynamically generated procedure.  Argument \Var{di}
is the pointer to the \Type{unw\_dyn\_info\_t} structure that
describes the procedure's unwind-info.

The \Func{\_U\_dyn\_cancel}() routine is guaranteed to execute in
constant time (in the absence of contention from concurrent calls to
\Func{\_U\_dyn\_register}() or \Func{\_U\_dyn\_cancel}()).


\section{Thread and Signal Safety}

\Func{\_U\_dyn\_cancel}() is thread-safe but \emph{not} safe to use
from a signal handler.

\section{See Also}

\SeeAlso{libunwind-dynamic(3)}, \SeeAlso{\_U\_dyn\_register(3)}

\section{Author}

\noindent
David Mosberger-Tang\\
Hewlett-Packard Labs\\
Palo-Alto, CA 94304\\
Email: \Email{davidm@hpl.hp.com}\\
WWW: \URL{http://www.hpl.hp.com/research/linux/libunwind/}.
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